package org.apache.maven.cli;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Properties;

import org.codehaus.plexus.util.IOUtil;
import org.codehaus.plexus.util.Os;
import org.slf4j.Logger;

/**
 * Utility class used to report errors, statistics, application version info, etc.
 *
 * @author jdcasey
 *
 */
public final class CLIReportingUtils {

  public static final long MB = 1024 * 1024;

  public static final int MS_PER_SEC = 1000;

  public static final int SEC_PER_MIN = 60;

  public static final String BUILD_VERSION_PROPERTY = "version";

  public static String showVersion() {
    final String LS = System.getProperty("line.separator");
    Properties properties = getBuildProperties();
    StringBuffer version = new StringBuffer();
    version.append(createMavenVersionString(properties)).append(LS);
    version.append(reduce(properties.getProperty("distributionShortName") + " home: "
        + System.getProperty("maven.home", "<unknown maven home>"))).append(LS);
    version.append("Java version: " + System.getProperty("java.version", "<unknown java version>") + ", vendor: "
        + System.getProperty("java.vendor", "<unknown vendor>")).append(LS);
    version.append("Java home: " + System.getProperty("java.home", "<unknown java home>")).append(LS);
    version.append("Default locale: " + Locale.getDefault() + ", platform encoding: "
        + System.getProperty("file.encoding", "<unknown encoding>")).append(LS);
    version.append("OS name: \"" + Os.OS_NAME + "\", version: \"" + Os.OS_VERSION + "\", arch: \"" + Os.OS_ARCH
        + "\", family: \"" + Os.OS_FAMILY + "\"");
    return version.toString();
  }

  /**
   * Create a human readable string containing the Maven version, buildnumber, and time of build
   * 
   * @param buildProperties The build properties
   * @return Readable build info
   */
  static String createMavenVersionString(Properties buildProperties) {
    String timestamp = reduce(buildProperties.getProperty("timestamp"));
    String version = reduce(buildProperties.getProperty(BUILD_VERSION_PROPERTY));
    String rev = reduce(buildProperties.getProperty("buildNumber"));
    String distributionName = reduce(buildProperties.getProperty("distributionName"));

    String msg = distributionName + " ";
    msg += (version != null ? version : "<version unknown>");
    if (rev != null || timestamp != null) {
      msg += " (";
      msg += (rev != null ? rev : "");
      if (timestamp != null) {
        SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ssZ");
        String ts = fmt.format(new Date(Long.valueOf(timestamp)));
        msg += (rev != null ? "; " : "") + ts;
      }
      msg += ")";
    }
    return msg;
  }

  private static String reduce(String s) {
    return (s != null ? (s.startsWith("${") && s.endsWith("}") ? null : s) : null);
  }

  static Properties getBuildProperties() {
    Properties properties = new Properties();
    InputStream resourceAsStream = null;
    try {
      resourceAsStream = MavenCli.class.getResourceAsStream("/org/apache/maven/messages/build.properties");

      if (resourceAsStream != null) {
        properties.load(resourceAsStream);
      }
    } catch (IOException e) {
      System.err.println("Unable determine version from JAR file: " + e.getMessage());
    } finally {
      IOUtil.close(resourceAsStream);
    }

    return properties;
  }

  public static void showError(Logger logger, String message, Throwable e, boolean showStackTrace) {
    if (showStackTrace) {
      logger.error(message, e);
    } else {
      logger.error(message);

      if (e != null) {
        logger.error(e.getMessage());

        for (Throwable cause = e.getCause(); cause != null; cause = cause.getCause()) {
          logger.error("Caused by: " + cause.getMessage());
        }
      }
    }
  }

}
